With the new Visual Market Insights connecting to our local MLS, it would make sense to add a function to send automatic new listing and status change email alerts to contacts (like you would through the MLS or IDX providers).
Being sent through Liondesk would also allow for many great tracking features to show with each contact (like which properties they viewed/liked/saved, how much time they spent on the page, how many photos they viewed, etc.).
You could even include monthly market reports (like Market Snapshot by Top Producer).
Altogether, that would make a great add-on. I would definitely pay more to have those functions integrated into a CRM.